Stoker mechanism.



P. L. CROWE & A. FRANKENHEIM.

STOKER MEGHANISM. APPLICATION FILED m13. 21, 190s.

Patented Feb. 14, 1911.

3 SHEETS`SHEET 1.

@wi/m1000015 P. L. CROWE L A. FRANKENHEIM. STOKBR MEGHANISM.

APPLICATION FILED FB.21,190B. I 984,077. Patented Feb. 14, 1911.

3 SHEETS-SHBET 2.

7 QV: bumsen @Mjmf P. L. GROWE L A. PRANKENHEIM. sToKER MBGHANISM.

APPLICATION FILED FEB.21, 1908Y 984,077..

Patented Feb. 14, 1911.

3 SHEETS-SHEET 3.

rant n snows, or' JERSEY Grrr, -Nnw JERSEY, AND AARON rniinnnimnrn, or new Yoan, N. Y.; SAID rnnnxnunnrn Assrenor. To sAID onown.

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Specication of Letters Patent.

application med rebruaryal, isos. serial No. nests.

retreated reet. ia, ieri..

To all 'wztm 'it may camera: Be it known that we, PAUL L. Cnown, a

. rsident of Jersey City, county'of Hudson,

' Mechanism,

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and State of New J ersey-,and AARON ,FRANK- ENHEIM, a resident of New York, county of New York, and State of New York, citizens of the United States, have invented certain new and useful Improvementsfin Stoker of which the following is a specicatioir.

This invention relates to mechanical stokers, and the Objectis to provide the endless chain grate construction of this -class of stokers with new 4and useful improvements which will make the stoker more etlicient.

. Referring to the drawings: Figure l isv lhousing. and end plate upon and in which bearing4 of vthe sprocket p wheel shaft is mounted andshowing the curved portion of the hood in section. Fig. 4 is a' front View of the Stoker showing the apron and hopper plate on the front thereof. Fig. 5 is a section on line' fr, Fig. 1`, looking in direction of arrow and showing the dump plate, and

the operatino rod thereof. Fig. 6 is a side4 and end view, respectively, of the wedge. Fig. 7 is a side and end view, respectively, of one of the bearings. Fig. 8 is a side and end view, respectively, of the shutter.4 Fig. 9

is a side View of part of the hopper end plate showing the wedge and the sliding hearing; The furnace consists of a bridge wall 2, and of a boiler, all of which may be of any construction.

Between the front of the furnace and the' Vbridge wall are mounted the upper channely lirons t and the lower angle irons'. The

channel irons 4 have their" parallel sides ex tending inwardly so as to perniit the air tol more freely circulate at the ends of thegrate hars'contiguous to said` channel irons. The.

channel irons are positioned adiacent to the side walls, the uppenedgesfof which are tened tothe front ofthe furnace. 4 rear of the aperture or slot 196 the housing side walls, thus forming a slight depression between the channel and the wall, which fills with ashes and tends to keep4 the walls cooler than they otherwise would be. The angle irons 5 are so placed that one side of the irons extends inward and the other side extends upward from the first named side. The dump plate actuating rod passes v through the upwardly extending sides of the angle irons and when the plate is allowed to dump the actuating rod may be brcurht to rest upon the inwardly extending si es of the angle irons, -thereby preventing the interfering of the rod with `the ash cart.' The channel and angle irons are eachlsupported at their front ends by the front wall of the furnace by any suitable means, at their rear ends,`in the bridge wall of the furnace, and interlnediately as shown. The channel neared slightly higher use the ossea in the irons 4 support the rear shafts 8 and the lcross rods 8a-upon which the grooved wheels 9 revolve. AThe angle irons 5 support the rods forming the bearings of the lower rollers 10.v A

The sprocket wheel shaft 14 is supported in the adjustable bearings 15, which rest and slide in the apertures or slots 1G formed between the hopper end plates 17 andfthe housing. This housing has an angled rear portion lextending* upto the upper portion of the hopper end plates. This extended portion 27 is formed for receiving the rear portion of the end plates 17 so that the said plates may rest directly over and in line with the housing. The extended portion 27 also permits the housing being securely fas- At the extends upward the full width of said sl'ot (see 20, Fig. Upon-this rear extension therear portion of the hopper end plates "rest, and are rrnly bolted to the upper portion ofthe angled extension of the housing. The lower edge of the end plates forms the upper portion of the slotand the front portions of the end plates extend downward the width of .the said slot or aperture lo, and continues farther downward on the inside of the housing to a point below 'the lower edge of the slot 2l, to ernlit of the end plate and housing being rnily secured together. l

To permit the hearings to slide easily in the slots 1.6 they are each provided with top and bottom grooves 19 (see Fig. 7). In order -to keep 'the apertures lor slots 16 closed and permit the adjustment of the bearings '15, sliding shutters 22 are placed outside of the casings andtin front of the bearings, which are each provided with the additional grooves `23 for receiving the .said shutters. The shutters are each supported in place by the studs 24 mounted ou each side of the easing. Over these studs are placed the tightening nut 25 for fixcdly holding the shutters in place on casing when desired.

The bearings are each adjusted in the slots by wedges 26 placed on the outside of casing between the said bearing and the rear angled portion 27 of the furnace; That portion of each of the bearings against which the Wedges act have cut in them a groove 28 which is on an angle corresponding with the slant of the wedges. Thus by raising and lowering the wedges the bearings may be proportionally moved inwardy or outward or set inward or outward. To'prevent the wedges from accidently moving so as to disturb the position of the bearings when the stoker is operating, we securesaid wedges in position by the nuts 30on studs supported in the rear angled poition of the housings. i

One end of the sprocket wheell shaft 14 passes into the gear box 31 supported on the outside of the furnace, and that portion of the shaft within the box is mounted with a worm wheel (not shown). The gear box supports the bearings of the ratchet wheel shaft, said shaft having a worm pinion meshing with worm wheel on sprocket shaft (said Worm and pinion not shown). The ratchet Wheel 32 is revolved by a pawl 33 suitably connected -to the rod 34 of the eccentric and power mechanism. The movement of the eccentric will thus be felt upon the sprocket shaft and also upon the cnd-v less traveling grate.

The grate bars 37 1n cross section are each edge of theA bevel portion of the bar away from the nose of the lap bars which nosewould obstruct the travel of the grate sho ld the said grate barshavefno bevel fuel surfaces; Another object in beveling the grate bars in cross section, is that the said 'bars` are facilitated in passing beneath the apron 40 positioned in front of the stoking mechanism. There is still another object and that is that it is a better protection to the bar teeth by the ashes lying upon the teeth and betweenthe teeth ofthe contiguousbars.` The bars are mounted on the links 41 of the endless chain, all of which moves vin the direction of the arrow, Fig. 1, over the sprocket lwheel 43 onshaft14 and' also over the grooved wheels' 44 on the rear shaft 8. As the chain grate travels in the direction of arrow, inward, it is supported by the idlers 9 but when it returns or travels outward it, is supported by the rollers 10 (see Fig. 1). l

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The wearand tear upon the chain grate will in time cause a small amount of slack to same. This slack is taken upby the sliding bearing 15 by yfirst unloosening the wedges and shutters, so that the said wedges may be driven down, which will move the bearings suficiently to take up the aforementioned slack. When the wedges are satisfactorily adjusted to take up the slack the wedges and shutters are again set and tightened.

That portion of the grate surface located under the hopper plate 44a' and stoker front is covered by an apron or hood 40 which serves to prevent the air escaping when a force draft is used. This apron is divided in two parts 46-47. The upper portion 46 is made curved to conform itself to the shape 'of the stoker. This curved-portion rests at 'iron 45EL and then locked against the curved upper half 46 bythe lever locks 49. The hopper plate 44 is then positioned above' the curved portion 46 of the hopper 40 by pass ing the hook on said plate into the eye 51 on the portion 46. Then by raising the said plate to its normal position (see Fig. 1) where the spring handles 52 on the plate will'instantly latch themselves into the apertures 53 formed in the hopper lend plates. There may be more than one hook 50 and eye .51 if 'the width yof the furnace `requires it. Thehook 5()v and eye 51 support the lapron at intermediate points and keep it from' sagging upon the grate bars and close the joints between apron and-bar to prevent the lair escaping.

At the rear of the furnace is mounted the dumpv plate 54 pivotally mounted on the channel irons 4, and suitably secured'there-` on. --This dump plate actsagainst t-he dump plateframe 66, which is. secured at the upper end to the said channel irons 4 (see Fig.

1)' and `at the lower end to the angleirons 5, in the inclined position as shown'in Fig. 1.

.The dump plate frame, is provided with .aow

`heavy end pieces which are adapted to' 'the inner portion of the channel irons and protect the same from the severe effects ofthe heat, between the ends ofthe trame and at its lowest portion it has a flange which is vvsupported in the bridge wall of the furnace rear portions with a circular cavity 'which fits loosely over the roundedy portion of the dump plate to allow said bars to freely move on same, and also `allow dump plate to' freely turn on the lap bars. The forward ends of said lap bars restuponv theV fuel surface of the grate'lars see Fig. l). 'llhe dump plate 54 is kept closed by the divided rod 56, the halves held together at their inner ends by bolt 58 passing through flanges 57 of each half. From the uniting point each half of the rod 56 is carried on a straight `linie 59 along the dump plate (see Fig. l) and outside saidplate the straight.

portions are bent downward on a right angle tothe angle .irons 5, where they are again bent outward at ka right angle and pass through said angle irons 5 on a straight l line parallel with straight portion 59, one

endof` which passing through the side walls 6l of the furnace where itis made square at the end to receive the weighted lever arm 62. The hopper plate .istat or near the lower' edgeI is provided' with one' or more apertures 63,- which are each covered, on the outside, with swinging lids. The apertures are used to insert a steel stirring bar-not shown. j

To facilitatethe removal of the ashes or the refuse as it falls from the dump plate a two-wheeled ash carjt G4 is employed, which is applied to the ash pit, and is provided with wheels made to follow the raised or a'grooved portion-,of the floor of said pit.V

The cart is mounted with casters 65 to insure its erect position and is wheeled in and' out Aof the pit by an operating rod which is long enou h for the operator to handle outside the urnace.

What we claim isz.

1. The combination of a furnace, a chain grate mounted to operate in said furnace and having the front end portion extending outside the said furnace, said chain grate provided with stationary bearings at its rear end and movable bearings at its front end,`

an air excluding .casing inclos'ing the front projecting portion of said chain grate, said casing provided with slots for the reception of the said movable Ibearings and in whilzh lfeeding fuel on the grate.

2. VThe oombinationlof a said bearings may be adjusted, wedges in-A terposed between said, furnace and said movable bearings, said bearing and wed s j serving to close the slot, and means or furnace, chain grate mounted tooperate in said furnace and having its front end portion extending outside the furnace, the chain grate provided lwith stationary bearings `at its rear end and movable bearings. at. its front end, an air excludingcasing inclosing the frontI projecting portlonof the chain grate and provided with slots for the reception of the said movable bearings, said casing consisting of divided end plates, 'a front plate and-a detachable hood, `means for securing the -hood in place, wedges interposed Abetween said furnace and bearings, .said

wedges serving to adjust said bearings in said slots, and also to close said slots,'means for locking said wedges and means `for feeding fuel to the grate.

3, Theeombination of'a furnace; a chain grate mounted to operate in said furnace and having the front end portion extending outside the furnace, the chain gratev` proan air excluding casing inclosing the front projecting portion offthechain grate, said casing comprising. end plates, said yend plates being` divided, said division forming a slot for the `reception of the said movable bearings in which said bearings may. bev adj ust-V ed, wedges'interposed between said furnace vand movable bearings, means for locking said wedges, shutters mounted'on said casing in front of said bearings, serving to close said slots, means for holding said shutters in place, and means for feeding fuel to the grate.

t. The combination'of a furnace, channel irons located along the side walls of said furnace, angle irons located along the side vwalls of said furnace below the said channel irons, a dump plate frame located between and Amounted on said `channel and angle irons, said frame` serving to rigidly secure the said irons together at the rear, a dump plate pivotally mounted on said channel irons, and acting against said dump plate frame, a dump plate operating rod, the horizontal portion of said rod which acts against said dump plate being divided, means for securing the halves of said rod together, said straight portions of said rod being bent downward at their outer ends, said verticalv portion being pivoted on the said angle irons, the end of one of the pivoted members being 'extended through the side wall 'of .said furnace, -a weighted lever arm mounted on the extended portion of said ear tension of said rod.

5. A chain grate comprlslng a frame, said `vided with stationary bearings' at its rear end and movable bearings at its front end,

`side extending inwardly of the frame, a

plurality of grate bars adapted to move atthe upper grate run between the channel irons and ,at the lower grate run between the langle irons, said grate bars each formed withI sloping fuel surfaces in cross section representing' an inverted V, said surface sloping from an intermediate 'point downward to the sides of the bar, lap bars pivotally mounted on said upper channel irons, the front end of said lap bars resting on the 'highest central portion ofthe sloping fuel surfaces of said grate bars, the sloping'portion permitting said grate bars -to travel safely under said lap bars at the upper run.

6. The combination of a furnace, channel irons located alongside the walls of said furnace, angle Virons located alongside the walls of said furnace below said channel irons, a dump plate frame mounted on said channel and angle irons', for rigidly secur- 'ing together said irons, a dump plate pivoted onsaid channel irons and acting against said frame, a dump plate operating rod pivoted in the angle irons",I said rod being so bent and formed .that when in its inoperative position it is supported by the flange of the angle iron, permittingl the dumping of ashes into a suitable ash receptacle.

7. The combination of a furnace, a chain grate mounted to operate in said furnace and having its front end portion extending out! side said furnace, an air excluding casing inclosing said outside extending portion, said` chain grate provided with stationary bearings at the rear end and movable bearings at its front end, said air excluding casing provided with a detachable hood, a hopper plate, said hopper plate having stirring bar apertures along its ylower edge` whereby-a stirrer may be inserted for agitating the fuel on the grate surface.

'8. The combination of a furnace, a bridge `wall in said furnace, a chain grate mounted to operate in said furnace and having the front end port-ion extending outside the/said furnace, an air excluding casing inclosing said outside extending portion, said chain grate provided with a frame comprising side bars, said side bars located along the side walls of said' furnace, a dump plate frame located lbetween and mounted on said side bars, said dump plate frame serving to rigand having the front end portionvextending outside the said furnace, a stationary frame mounted permanently 1n said furnace, side bars comprising said framing, said side bars running along the side walls of said furnace and running short of the outside extending portion of the chain grate, and secured to the inside of the front wall of said furnace, said side bars of said framing positioned ladjacent said offsets in side walls, the upper edge of said side bars located slightly above the upper edge of said offsets. y

10. The combination of a furnace, a bridge wall in said furnace, a chain grate mounted to operate in said furnace and having the front end portion extending' outside the said furnace, an-air excluding casing inclosing said furnace, said chain grate comprising a grate frame of side vbars consisting of channel irons supporting the upper grate run, and angle irons supporting the lowergrate run, and spaced apart at the rear by a dump plate frame, and at the front by the front wall, the parallel sides of the irons extending inwardly of the frame adjacent to the side walls, said grate frame having its front end Supported by the front wall, its rear endA by said bridge wall, and means for intermediatcly supporting said grate frame, a dump plate supported by said grate frame and-adapted to rest against said dump plate frame when in closed position, and an operating rod for the dump plate pivoted in the lower side angle irons, said operating rod being so bent and formed that when in-its inoperative position it is supported by the flange of the angle irons and permitting with the'dump plate an unobstructedcompartment'y for the use of an'ash receptacle below them. Y

Signed at New York in the county of New York and State of .New York this 19th day of February A. D. 1908.

` PAUL L. CROVE.

AARON ERANKENHEIM. Witnesses:

' MARCUS GARDINER,

FRANK J. DUFFY. 

